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/** \addtogroup acc_module Working with ACC
 *  \ingroup peripherals_module
 * The ACC driver provides the interface to configure and use the ACC
 * peripheral.\n
 *
 * It applies comparison on two inputs and gives a compare output.
 *
 * To Enable a ACC Comparison,the user has to follow these few steps:
 * <ul>
 * <li> Enable ACC peripheral clock by setting the corresponding bit in
 *     PMC_PCER1 (PMC Peripheral Clock Enable Register 1)
 * </li>
 * <li> Reset the controller by asserting ACC_CR_SWRST in ACC_CR(ACC Control
 * Register) </li>
 * <li> Configure the mode as following steps:  </li>
 * -#   Select inputs for SELMINUS and SELPLUS in ACC_MR (ACC Mode Register).
 * -#   Enable Analog Comparator by setting ACEN in ACC_MR.
 * -#   Configure Edge Type to detect different compare output.
 * </li>
 * <li> Wait until the automatic mask period expires by polling MASK bit in
 *      ACC_ISR.
 * </ul>
 *
 * For more accurate information, please look at the ACC section of the
 * Datasheet.
 *
 * Related files :\n
 * \ref acc.c\n
 * \ref acc.h\n
 */
/*@{*/
/*@}*/
/**
 * \file
 *
 * Implementation of Analog Comparator Controller (ACC).
 *
 */
/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/

#include "chip.h"
#include "acc.h"

/*----------------------------------------------------------------------------
 *        Exported functions
 *----------------------------------------------------------------------------*/

/**
 * \brief Initialize the ACC controller
 *
 * \param pAcc Pointer to an Acc instance.
 * \param idAcc ACC identifier
 * \param ucSelplus input connected to inp, 0~7
 * \param ucSelminus input connected to inm,0~7
 * \param wAc_en Analog comparator enabled/disabled
 * \param wEdge CF flag triggering mode
 * \param wInvert INVert comparator output,use pattern defined in the device
 * header file
 */
extern void ACC_Configure(Acc *pAcc, uint8_t idAcc, uint8_t ucSelplus,
						   uint8_t ucSelminus, uint16_t wAc_en, uint16_t wEdge, uint16_t wInvert)
{
	/* Enable peripheral clock*/
	PMC->PMC_PCER1 = 1 << (idAcc - 32);

	/*  Reset the controller */
	pAcc->ACC_CR |= ACC_CR_SWRST;

	/*  Write to the MR register */
	ACC_CfgModeReg(pAcc,
					((ucSelplus << ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk) |
					((ucSelminus << ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk) |
					((wAc_en << 8) & ACC_MR_ACEN) |
					((wEdge << ACC_MR_EDGETYP_Pos) & ACC_MR_EDGETYP_Msk) |
					((wInvert << 12) & ACC_MR_INV));
	/* set hysteresis and current option*/
	pAcc->ACC_ACR = (ACC_ACR_ISEL_HISP
					 | ((0x01 << ACC_ACR_HYST_Pos) & ACC_ACR_HYST_Msk));

	/* Automatic Output Masking Period*/
	while (pAcc->ACC_ISR & (uint32_t)ACC_ISR_MASK);
}

/**
 * Return the Channel Converted Data
 * \param pAcc Pointer to an Acc instance.
 * \param ucSelplus input applied on ACC SELPLUS
 * \param ucSelminus input applied on ACC SELMINUS
 */
extern void ACC_SetComparisonPair(Acc *pAcc, uint8_t ucSelplus,
		uint8_t ucSelminus)
{
	uint32_t dwTemp;

	assert(ucSelplus < 8 && ucSelminus < 8);

	dwTemp = pAcc->ACC_MR;
	pAcc->ACC_MR =
		dwTemp & (uint32_t) ((~ACC_MR_SELMINUS_Msk) & (~ACC_MR_SELPLUS_Msk));

	pAcc->ACC_MR |= (((ucSelplus << ACC_MR_SELPLUS_Pos) & ACC_MR_SELPLUS_Msk) |
					((ucSelminus << ACC_MR_SELMINUS_Pos) & ACC_MR_SELMINUS_Msk));
}

/**
 * Return Comparison Result
 * \param pAcc Pointer to an Acc instance.
 * \param dwStatus value of ACC_ISR
 */
extern uint32_t ACC_GetComparisonResult(Acc *pAcc, uint32_t dwStatus)
{
	uint32_t dwTemp = pAcc->ACC_MR;

	if ((dwTemp & ACC_MR_INV) == ACC_MR_INV)  {
		if (dwStatus & ACC_ISR_SCO) {
			return 0; /* inn>inp*/
		} else {
			return 1;/* inp>inn*/
		}
	} else {
		if (dwStatus & ACC_ISR_SCO) {
			return 1; /* inp>inn*/
		} else {
			return 0;/* inn>inp*/
		}
	}
}

